(1) KRS 189.221 to 189.230 and 189.280 shall not apply to motor trucks, semitrailer trucks, or trailers owned by the United States, the Commonwealth of Kentucky, or any agency of them, any county or city.
(2) If any motor truck, semitrailer truck, or trailer is lawfully licensed by a city pursuant to KRS 186.270, then KRS 189.221 and subsection (1) of 189.222 shall not apply thereto, within the limits of the city issuing the license, or within fifteen (15) miles of the limits of the city, except on such state-maintained highways or portions thereof, including connecting-link streets, as may be designated by the commissioner of highways, and on such county highways as may be designated by the county judge/executive; provided, however, that in no case shall any vehicle exceed the weight and size limitations established by the city ordinance when those limitations are less stringent than those provided in the aforementioned sections of the statutes. For the purposes of this subsection vehicles exempt from the imposition of a city license tax by reason of subsection (2) of KRS 281.830 shall be entitled to the same exemptions as those so licensed.
(3) Cities may, by ordinance, provide maximum limits with respect to the weight, height, width and length of motor trucks, semitrailer trucks, and trailers on city- owned and maintained streets and roads within their respective boundaries.